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《Journal of Stratigraphy》 1990-04
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Upper Cambrian in the Cili-Taoyuan area, Hunan and its trilobite succession

Peng Shan-chi  
The Upper Cambrian in the Taoyuan-Cili area, northwestern Hunan constitutes a thick carbonate sequence containing mainly dark-colored deep water laminated argillaceous limestone and turbidite with intercalations of light-colored transported and, sometimes, folded, shallow water limestone, limestone breccia and intraformational limestone conglomerate.Sedimentation evidences suggests that it was possibly deposited in the lower part of a ocean-facing continental slope.Trilobite fauna shows both assemblages of the Southeast-and the North-China types associated with endemfc elements.Lithologically, the Upper Cambrian can be divided into three formations, the Chefu Formation below, the Bitiao Formation and Shenjiawan Formation above.The Shen jiawan section in the Taoyuan-Cili area is widely accepted as a stratotype section of both the Bitiao and Shenjiawan Formations of the Wulingshan {Wuling Mountains) Region in the Jiangnan Slope Belt.A complete Late Cambrian trilobite succesion with 15 assemblage zones and 2 assemblage sub-zones is proposed, namely in ascending order: 1 Formosagnostus jarmosus-Distazerts A.-Z.,2.Ag-nostascus (Paragnostascus) sincnsis A.-Z., 3.Liostra etna bella~Ammagnosttt sincnsis A.,-Z., 4.Glyp-tagnoszus stolidotus A.Z., 5.Glyptagnostus reticula tus reticulatus-Chuangia wulingensis A..-Z., 6-In-nitcignosttit inexpcctans-Procer atopy ge (Proceratopygc) protrada A-Z , 7.Coryncxochits plumula-Proce-ratopyge (Sinoproccr atopy g€} cf.Jyangshancnsis A.-Z., 8.Agnostotcs clavata-lrvingcUa angustihmbatus A.-Z., 9.Rkaptagnostus cihensis-Onchonoiellus cf.kurukiagensis AAZ-, 10.Lotagnostus (Eolatagnos-luc) docurus-Kaolishaniella A.-Z.,11.Probilacunasps nasalis-Peichashania hunanensis A.-Z.,12.Lo-.tagnostus (Lota gnostics) punctatiis-Hedinaspis re gaits A.-Z.12a.Lotagnwstus'(Disiagnortus) celatus-Charchagra glabrescens A.-Z.,12b.Shergoldio-lvshmaspjs A.-Z., 13.Eulonia (Archaculoma) taoyuancnse-Leiagnostus cf.bcxelli A.-Z., 14.Mictisaubja striata-Ftatocephatus 'A.-Z.and 15.Leiostegium (Lciaste-gium) constrictum-Shcnjiawania brevica A.-Z-,Among them, zones 1-4 belong to the Chefu Formation, 5-10 to the Bitiao Formation and 11-15 to the Shenjiawan Formation.Relationship of the Bitiao Formation in the Cili-Taoyuan area to that at its type locality near Bitiao, Baojing County and other localities in western Hunan is discussed with reviews of other problems concerning the stratigraphy of the Wulingshan Region.
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